The building envelope decides everything.
Air. Thermal. Moisture. If you don't get the envelope right, nothing else performs. Brian Iverson has spent five decades learning that and built Carbonless to make sure you don't have to learn it the hard way.
Welcome to Carbonless.
Before a single appliance runs, most buildings already have a problem — they just can’t show you where. It’s in the wall. At the roof-to-wall connection. Under the slab. Air leaks through gaps no inspector flags. Moisture collects inside assemblies no one can see. Heat moves through every stud, uninterrupted. Equipment can compensate for a while, but it can’t fix what the envelope got wrong.
Carbonless exists to change that.
Founded by Brian Iverson — inventor, degrees in architecture and civil engineer, and former Certified Energy Auditor with decades of hands-on field experience across hundreds of building projects — Carbonless is the most practical, field-tested resource for high-performance building envelope education in North America.
Whether you're a homeowner who wants a durable, healthy home, a builder ready to move beyond code-minimum, an architect detailing your first Passive House assembly, or a developer building at scale across climate zones, Carbonless gives you exactly what you need: the science explained plainly, the assemblies verified, and the tools ready to use.
Our Mission
To eliminate energy waste, moisture damage, and sick buildings — one properly designed envelope at a time. We teach the physics that code books skip, translate building science into field-ready decisions, and help every person in the building chain understand what a high-performance envelope actually means.
Most buildings are already failing before anyone moves in.
Not because of bad materials. Not because of lazy workers. Because nobody taught the people who built them what actually happens inside a wall — how heat moves through every stud, how moisture collects in places no inspector ever looks, how air leaks through gaps that no code requires anyone to seal.
This book is about fixing that.
Brian Iverson has spent more than five decades in construction — as a carpenter, designer, energy auditor, and inventor. He has seen what code-minimum buildings become over time. And he wrote this book so that you don’t have to learn what he learned the hard way.
What you’ll walk away with:
∙ A clear understanding of the four control layers that govern every building envelope
∙ The ability to identify where buildings fail — and why
∙ Practical, economically sound strategies for new construction and retrofits
∙ The confidence to build beyond code minimum, in any climate
Whether you’re a builder who listens between job sites, a homeowner trying to understand why your house costs so much to heat and cool, or an architect designing your first high-performance assembly — this is the science explained straight, without the jargon.
Narrated by a professional voice actor and paired with the complete ebook for reference at home or in the field. Two formats. One education.
Net Zero isn’t a luxury. It’s what happens when you get the envelope right.
Includes both the full audiobook and complete ebook.
Everything You Need to Build the Envelope Right.
Carbonless resources are built around the four control layers that govern every building enclosure: the thermal barrier, the air barrier, the vapor control layer, and the bulk water management layer. Each product teaches you how these layers interact — and how to get them right in any climate.
Your proven system to build or retrofit a home that lasts 100 years — with dramatically lower energy bills, no mold, and the confidence that you got it right.
You don’t have to guess anymore.
Build or fix your home the right way — once — and sleep easy knowing you protected your family, your wallet, and the thin peel of our planet we all share.
This is for every homeowner, builder, and contractor who is done accepting “good enough” houses that quietly cost a fortune in energy bills, mold repairs, and regret.
I’ve already done the hard part. Now it’s your turn to build it right.
Hey, it’s Brian here.
For 50+ years I’ve been the person called in to figure out why a building is sweating, molding, rotting, or bleeding energy. I used to think of myself as a physician for sick houses. I’ve come to realize I’m more like a neurologist — diagnosing the nervous system of walls, roofs, foundations, and ventilation so they stay healthy for the next 100 years.
I’ve poured millions of my own dollars into figuring this out. I built my own Thermal Suite — 1,200 square feet, under $200k, running on roughly $60 a month in HVAC — and created a system that tests thousands of design combinations at once.
What I learned didn’t come from a textbook. It came from real buildings, real failures, and real climates across all 8 North American climate zones.
Now I’ve distilled all of it into this system — so you don’t have to spend decades or a fortune to get it right.
New construction done right from day one.
Retrofits that actually solve the problem permanently.
Homes that cut energy use 50–90%, eliminate mold risk, and feel genuinely good to live in — without expensive gimmicks or chasing a code minimum that still underperforms.
This is your permission to build like the future depends on it. Because it does. And you are more than capable.
What You Get
Envelope Mastery Playbook — 95-Page Ebook
The building science explained the way a mentor explains it — clearly, plainly, and without a textbook in sight. You’ll finally understand how buildings actually behave, so you never second-guess a decision again.
Super-Efficient Execution Checklist — 13-Page Field-Ready Tool
Print it. Take it to the job site. Hand it to your contractor. The exact step-by-step sequence that keeps every control layer in place and mold out of the picture.
Bonus: Thermal Suite Deconstruction
My own house broken down layer by layer — exact R-values, products, and real-world results — so you can copy what already works instead of starting from scratch.
Free Bonus: Carbonless — An Introduction to Sustainable Building Ebook
My foundational book, sold on Amazon, included here free to give you the full picture before you even begin.
Who This Is For
∙ Homeowners who want their forever home built right the first time
∙ Builders and remodelers ready to stand above the competition
∙ Anyone who typed “Carbonless” because they’re done settling for average
You’ve already taken the first step.
That tells me you care.
Now let me help you finish strong.
Your family, your future self, and the thin peel of our planet will thank you.
— Brian Iverson
You didn’t build this house. But you’re the one living with what it got wrong.
Maybe it’s a mold problem that keeps coming back. Maybe it’s an energy bill that never made sense no matter what you’ve replaced. Maybe you’re about to renovate and you’re scared — because you’ve heard enough horror stories to know that adding insulation in the wrong place can make things worse, not better.
That fear is legitimate. And it’s exactly why this guide exists.
Most retrofit problems aren’t mistakes. They’re predictable reactions to changing how an existing house handles heat, air, and moisture. Good intentions — adding insulation, sealing leaks, upgrading windows and systems — can trap moisture, create cold surfaces, or produce mold where it never appeared before. Not because you did something wrong. Because nobody explained the physics before the walls closed in.
This guide explains the physics. Before the walls close in.
Built for Real Houses. Not New Construction Theory.
Brian Iverson has spent fifty years diagnosing what goes wrong in existing buildings. Not theoretical buildings. Real ones — with 1908 Craftsman bones, mid-century assemblies, decades of well-meaning upgrades layered on top of each other, and moisture stories nobody ever told the homeowner.
This guide is built around the 2126 Rule — a framework for retrofitting assemblies that dry properly, recover from mistakes, surface problems early, and hold up for generations. Not code minimum. Not perfection. Durable, forgiving, honest construction that lets you close walls with confidence.
At $49, it is the most affordable entry point into the Carbonless education system — and for many homeowners and remodelers, it is the only guide they will ever need.
What’s Inside
How buildings actually move heat, air, and moisture — and why cold surfaces are always the first place trouble starts, not the last.
Why mold appears in otherwise normal houses — almost always condensation, not leaks. Understanding this changes everything about how you approach a renovation.
Why climate reveals problems — it doesn’t create them — your house had the problem before the cold snap. The cold snap just made it visible.
You’re not breaking the house — you’re changing it — how to anticipate what changes when you improve an assembly, and how to choose reactions that solve the problem permanently.
Practical rebuild strategies — flash-and-batt, smart membranes, exterior insulation, and more. Real options for real budgets and real existing structures.
Forgotten edges — rim joists, ceilings, and why they often need attention before anything else. The places no one looks until something goes wrong.
The evolution of insulation — and why older, more forgiving houses can struggle when modern materials are added without understanding the moisture story they’re interrupting.
Two Real-World Case Studies
Case Study #1 — How This House Got Sick
A mid-20th-century assembly dissected layer by layer. What went wrong, why it went wrong, and how physics-first fixes prevent it from ever coming back.
Case Study #2 — 1908 Craftsman
Thermal imaging analysis of energy loss and retrofit gaps in a century-old house. What the images revealed, what they meant, and what to do about it.
Resilience Over Perfection
This is not a guide about achieving the perfect assembly. It’s a guide about understanding your house well enough to make it durable, healthy, and forgiving — on a real budget, in a real climate, without starting over from scratch.
Slow down. Understand the moisture story. Close the walls with confidence.
Carbonless Logic Building Envelope Training
The complete audio training that teaches homeowners and builders the building science principles behind high-performance, energy-efficient construction — in plain language, from the field.
Carbonless Builder Wall Assembly Reference Library
700+ Verified Wall Assemblies. One-Time Purchase.
Lifetime Access. Ongoing Updates.
Licensed for one individual user. Also includes downloads for the Carbonless Logic Playbook and Checklist, Carbonless: Intro to Sustainable Building Ebook, and the Carbonless Retrofit Education Document.
Licensed to one company and allows up to 10 users under a single shared login. Also includes downloads for the Carbonless Logic Playbook and Checklist, Carbonless: Intro to Sustainable Building Ebook, and the Carbonless Retrofit Education Document.
A PRACTICAL GUIDE TO BUILDING SMARTER, MORE EFFICIENT, AND SUSTAINABLE STRUCTURES.
“The book explores sustainable living through the concept of "thermal living," focusing on energy efficiency and reducing reliance on fossil fuels. Iverson offers practical solutions and encourages a mindset shift towards more environmentally conscious choices. The book is accessible, blending science and real-world examples to show how we can live in better harmony with the planet. Overall, it's a timely and engaging read for anyone interested in sustainability and the future of energy. Highly recommend this book!”
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